C Reference Cheat Sheet Page 12
ADVERTISEMENT
1
2
3
4
5
6
7
8
9
10
11
12
13C Reference Cheat Sheet
by
Ashlyn Black
via
The Time Library
Unary Operators (cont)
Returns a then decrements a by 1. (a = a - 1)
#include <time.h>
a--
Variable Types
Typecasts a as type.
(type)a
Stores the calendar time.
Memory location of a.
time_t
&a;
Stores a time & date breakdown.
Memory size of a (or type) in bytes.
struct tm *x;
sizeof(a)
tm structure members:
Binary Operators
Seconds, 0 to 59.
int tm_sec
by descending evaluation preced e nce
Minutes, 0 to 59.
int tm_min
Product of a and b. (a × b)
a * b;
Hours, 0 to 23.
int tm_hour
Quotient of dividend a and divisor b. Ensure divisor is non-
a / b;
Day of the month, 1 to 31.
int tm_mday
zero. (a ÷ b)
Month, 0 to 11.
int tm_mon
Remainder of integers dividend a and divisor b.
a % b;
Years since 1900.
int tm_year
Sum of a and b.
a + b;
Day of the week, 0 to 6.
int tm_wday
Difference of a and b.
a - b;
Day of the year, 0 to 365.
int tm_yday
b
Left bitwise shift of a by b places. (a × 2 )
a << b;
Daylight saving time.
int tm_isdst
-b
Right bitwise shift of a by b places. (a × 2 )
a >> b;
Functions
Less than. True if a is less than b and false otherwise.
a < b;
Returns unix epoch time (seconds since
time(NULL)
Less than or equal to. True if a is less than or equal to b and
a <= b;
1/Jan/1970.)
false otherwise. (a ≤ b)
Stores the current time in a time_t
time(&time_t);
Greater than. True if a is greater than than b and false
a > b;
variable.
otherwise.
Returns a time_t variable as a string.
ctime(&time_t)
Greater than or equal to. True if a is greater than or equal to
a >= b;
Breaks time_t down into struct tm
x = localtime(
b and false otherwise. (a ≥ b)
members.
&time_t);
Equality. True if a is equal to b and false otherwise. (a ⇔ b)
a == b;
Inequality. True if a is not equal to b and false otherwise. (a ≠
Unary Operators
a != b;
b)
by descending evaluation preced e nce
Bitwise AND of a and b. (a ⋂ b)
a & b;
Sum of 0 (zero) and a. (0 + a)
+a
Bitwise exclusive-OR of a and b. (a ⊕ b)
a ^ b;
Difference of 0 (zero) and a. (0 - a)
-a
Complement (logical NOT) of a. (~a)
!a
Binary ones complement (bitwise NOT) of a. (~a)
~a
Increment of a by 1. (a = a + 1)
++a
Decrement of a by 1. (a = a - 1)
--a
Returns a then increments a by 1. (a = a + 1)
a++
By Ashlyn Black
Published 28th January, 2015.
Sponsored by
Last updated 20th April, 2015.
Measure your website readability!
Page 12 of 13.
ADVERTISEMENT
0 votes
Related Articles
Related forms
Related Categories
Parent category: Education